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检索条件"任意字段=3rd IEEE International Conference on Distributed Computing in Sensor Systems"

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Bottleneck around base station in wireless sensor network and its solution

Bottleneck around base station in wireless sensor network an...

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3rd Annual international conference on Mobile and Ubiquitous System - Networking and Services

作者： Padmanabh, Kumar Roy, Rajarshi Indian Inst Technol Kharagpur 721302 West Bengal India

ISBN: (纸本)9781424404988

The sensor nodes in a network are connected to the outer world via a base station. Base stations (BS) have some back up power and it is not suppose to fail due to shortage of battery power. The nodes which are away from the base station communicate to it via the nodes which are in proximity of BS. So, the nodes which are nearer to BS have additional communication responsibilities of forwarding data of distant nodes. Thus the nodes which are in proximity of BS will run out of battery power very soon and create bottleneck for communication. In this paper we have proposed that if the density of sensor nodes increases as we move towards base station this effect can be minimized. We found the required exact density of the sensor nodes at a particular distance from BS to avoid bottleneck phenomenon around it. We have considered the real life scenario where the nodes generate data only when there is an event of interest with a given probability of occurrence. The main contribution of this paper with our proposed strategy is lifetime offered per unit cost of deployment is almost double.

关键词： wireless sensor network network lifetime maximum lifetime routing

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A group based reputation system for P2P networks

A group based reputation system for P2P networks

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3rd international conference on Autonomic and Trusted computing

作者： Tian, Huirong Zou, Shihong Wang, Wendong Cheng, Shiduan Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100088 Peoples R China

ISBN: (纸本)354038619X

In large scale P2P networks, it is less likely that repeat interactions will occur between same peers for the asymmetric interests between them. So it is difficult to establish the direct trust relationship between peers and the network is vulnerable to malicious peers. A group based reputation system GroupRep for P2P networks is proposed in this paper to solve this problem. In GroupRep, the trust relationship is classified into three tiers: the trust relationship between groups, between groups and peers, and between peers. A peer evaluates the credibility of a given peer by its local trust information or the reference from the group it belonging to. A filtering cluster algorithm is proposed to filter unfair ratings provided by malicious peers. As a result, good peers are distinguished from malicious ones. Choosing the download source based on the trust value of responders can make good peers happy with the high ratio of the success query and the high satisfaction level under malicious collusive attacks with front peers.

关键词： distributed computer systems

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Application-centric networking framework for wireless sensor nodes

Application-centric networking framework for wireless sensor...

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3rd Annual international conference on Mobile and Ubiquitous System - Networking and Services

作者： Choi, Sukwon Cha, Hojung Yonsei Univ Dept Comp Sci Seoul 120749 South Korea

ISBN: (纸本)9781424404988

Wireless sensor network technology has found diverse applications in numerous fields. As the networking technology is refined in many ways, the need for system modulation with effective performance becomes essential. A multitude of architectures, which includes system abstraction and layering, has been proposed to solve the need at the operating system level. However, previous efforts do not qualify for networking architecture required by sensor networking, since they are aimed at hardware abstraction or protocol-based layering. In this paper, we classify developers into kernel, network and application developers and propose a network architecture that enables those developers to program independently. Network stack is separated into three different layers;MLL, NSL, DNL. This three-layered architecture provides an effective programming environment to sensor network developers by minimizing modification of other layers and maximizing reusability of the networking module. To validate the proposed mechanism, we implemented and assessed the performance with a few network algorithms and applications, based on the RETOS, which supports a dynamic loadable kernel module.

关键词： Network architecture

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SenCar: An energy efficient data gathering mechanism for large scale multihop sensor networks

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2nd ieee international conference on distributed computing in sensor systems

作者： Ma, Ming Yang, Yuanyuan SUNY Stony Brook Dept Elect & Comp Engn Stony Brook NY 11794 USA

ISBN: (纸本)3540352279

In this paper, we propose a new data gathering mechanism for large scale multihop sensor networks. A mobile data observer, called SenCar, which could be a mobile robot or a vehicle equipped with a powerful transceiver and battery, works like a mobile base station in the network. SenCar starts the data gathering tour periodically from the static data processing center, traverses the entire sensor network, gathers the data from sensors while moving, returns to the starting point, and finally uploads data to the data processing center. Unlike SenCar, sensors in the network are static, and can be made very simple and inexpensive. They upload sensing data to SenCar when SenCar moves close to them. Since sensors can only communicate with others within a very limited range, packets from some sensors may need multihop relays to reach SenCar. We first show that the moving path of SenCar can greatly affect the network lifetime. We then present heuristic algorithms for planning the moving path/circle of SenCar and balancing traffic load in the network. We show that by driving SenCar along a better path and balancing the traffic load from sensors to SenCar, the network lifetime can be prolonged significantly. Our simulation results demonstrate that the proposed data gathering mechanism can greatly prolong the network lifetime compared to a network which has only a static observer, or a network in which mobile observer can only move along straight lines. © Springer-Verlag Berlin Heidelberg 2006.

关键词： SenCar wireless sensor networks data gathering load balancing

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Automatic updating of a book storage database in a ubiquitous library information system

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3rd international conference on Ubiquitous Intelligence and computing

作者： Araki, Hideaki Haga, Hirohide Kaneda, Shigeo Doshisha Univ Grad Sch Engn Kyotanabe 6100321 Japan

ISBN: (纸本)3540380914

This article proposes the Augmented Library (AL), which is a library system augmented by ubiquitous computing (UbiComp) technology. In UbiComp, users interact with computers without being aware that they are actually using a computer. We applied the UbiComp concept to a library system. In the AL, the action of removing and returning books, which are the natural actions in a library, become the library system's input. This function is called a "real-time book database update." The system uses a combination of infrared sensors and CCD cameras to identify which book is moved from the shelf. After developing a prototype a prototype system, we conducted experiments that investigated the effectiveness and effectiveness and efficiency of AL.

关键词： library system real-time processing book retrieval CCD camera infrared sensor image data processing multi thread processing

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Bayesian inference in a distributed associative neural network for adaptive signal processing

Bayesian inference in a distributed associative neural netwo...

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3rd international conference on Informatics in Control, Automation and Robotics

作者： Zeng, Qianglong Zeng, Ganwen Bellevue High Sch Bellevue WA USA

ISBN: (纸本)9728865619

The primary advantages of high performance associative memory model are its ability to learn fast, store correctly, retrieve information similar to the human "content addressable" memory and it can approximate a wide variety of non-linear functions. Based on a distributed associative neural network, a Bayesian inference probabilistic neural network is designed implementing the learning algorithm and the underlying basic mathematical idea for the adaptive noise cancellation. Simulation results using speech corrupted with low signal to noise ratio in telecommunication environment shows great signal enhancement. A system based on the described method can store words and phrases spoken by the respect to noise, regardless of its origin and level. New words, pronunciations, and languages can be introduced to the system in an incremental, adaptive mode.

关键词： Bayesian inference neural network adaptive signal processing

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distributed cooperative rate adaptation for energy efficiency in ieee 802.11-based multi-hop networks 06

Distributed cooperative rate adaptation for energy efficienc...

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3rd international conference on Quality of Service in Heterogeneous Wired/Wireless Networks

作者： Wang, Kun Yang, Fan Zhang, Qian Wu, Dapeng Oliver Xu, Yinlong Dept. of CS University of Science and Technology of China Hefei Anhui China Microsoft Research Asia Beijing China Dept. of CS Hong Kong University of Science and Technology Hong Kong Hong Kong Dept. of ECE University of Florida Gainesville FL United States

ISBN: (纸本)1595935371

In this paper we study the problem of using the rate adaptation technique to achieve energy efficiency in an ieee 802.11-based multi-hop network. Specifically, we formulate it as an optimization problem, i.e., minimizing the total transmission power over transmission data rates, subject to the traffic requirements of all the nodes in a multi-hop network. Interestingly, we can show that this problem is actually a well-known multiple-choice knapsack problem, which is proven to be an NP-hard problem. So, instead of finding an optimal solution, which is NP-hard, we seek a sub-optimal solution. Our key technique to attack this problem is distributed cooperative rate adaptation. Here, we promote node cooperation due to our observation that the inequality in non-cooperative channel contention among nodes caused by hidden terminal phenomenon in a multi-hop network tends to result in energy inefficiency. Under this design philosophy, we propose a distributed cooperative rate adaptation (CRA) scheme and prove that it converges. Simulation results show that our CRA scheme can reduce the power consumption up to 86% as compared to the existing (non-cooperative) algorithm. © 2006 ACM.

关键词： Wireless networks

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System architecture and economic value-chain models for healthcare privacy and security control in large-scale wireless sensor networks

System architecture and economic value-chain models for heal...

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3rd international conference on Autonomic and Trusted computing

作者： Song, Won Jay Ha, Im Sook Choi, Mun Kee Univ Virginia Dept Comp Sci Charlottesville VA 22904 USA

ISBN: (纸本)354038619X

In this paper, we have designed and modeled the ubiquitous RFID healthcare system architecture and framework workflow, which are described by six classified core players or subsystems, and have also analyzed by an economic value-chain model. They consist of the patient and wearable ECG sensor, network service, healthcare service, emergency service, and PKI service providers. To enhance the security level control for the patient's medical privacy, individual private and public keys should be stored on smart cards. All the patient and service providers in the proposed security control architecture should have suitable secure private and public keys to access medical data and diagnosis results with RFID/GPS tracking information for emergency service. By enforcing the requirements of necessary keys among the patient and service providers, the patient's ECG data can be protected and effectively controlled over the open medical directory service. Consequently, the proposed architecture for ubiquitous RFID healthcare system using the smart card terminal is appropriate to build up medical privacy policies in future ubiquitous sensor networking and home networking environments. In addition, we have analyzed an economic value-chain model based on the proposed architecture consisting of RFID, GPS, PDA, ECG sensor, and smart card systems in large-scale wireless sensor networks and have also derived customer needs in the proposed service architecture using the value-chain model. Therefore, we also conclude that the business and technology issues for the service providers should exist in the networks.

关键词： Health care

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Distance-sensitive information brokerage in sensor networks

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2nd ieee international conference on distributed computing in sensor systems

作者： Funke, Stefan Guibas, Leonidas J. Nguyen, An Wang, Yusu Stanford Univ Dept Comp Sci Stanford CA 94305 USA Ohio State Univ Dept Comp Sci & Engn Columbus OH 43210 USA

ISBN: (纸本)3540352279

In a sensor network information from multiple nodes must usually be aggregated in order to accomplish a certain task. A natural way to view this information gathering is in terms of interactions between nodes that are producers of information, e.g., those that have collected data, detected events, etc., and nodes that are consumers of information, i.e., nodes that seek data or events of certain types. Our overall goal in this paper is to construct efficient schemes allowing consumer and producer nodes to discover each other so that the desired information can be delivered quickly to those who seek it. Here, efficiency means both limiting the redundancy of where producer information is stored, as well as bounding the consumer query times. We introduce the notion of distance-sensitive information brokerage and provide schemes for efficiently bringing together information producers and consumers at a cost proportional to the separation between them - even though neither the consumers nor the producers know about each other beforehand. Our brokerage scheme is generic and can be implemented on top of several hierarchical routing schemes that have been proposed in the past, provided that they are augmented with certain key sideway links. For such augmented hierarchical routing schemes we provide a rigorous theoretical performance analysis, which further allows us to prove worst case query times and storage requirements for our information brokerage scheme. Experimental results demonstrate that the practical performance of the proposed approaches far exceeds their theoretical (worstcase) bounds. The presented algorithms rely purely on the topology of the communication graph of the sensor network and do not require any geographic location information. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Telecommunication networks

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TinySIP: Providing seamless access to sensor-based services

TinySIP: Providing seamless access to sensor-based services

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3rd Annual international conference on Mobile and Ubiquitous System - Networking and Services

作者： Krishnamurthy, Sudha Deutsche Telekom Lab Berlin Germany

ISBN: (纸本)9781424404988

Recent technological trends are transforming sensor nodes from passive data-gathering entities to a collaborative network of sensors, capable of providing data-related and event-related information services. Such a sensor-based information service is useful only if it can be seamlessly accessed across traditional networks and through familiar device interfaces. In order to enable such ubiquitous access to sensor-based services, we need a remote messaging protocol that supports versatile messaging options, interoperates over different types of network, and allows messages to be routed based on flexible attribute-based addressing of endpoints. Furthermore, in order to ensure ease of adoption and deployment within an enterprise as well as in consumer environments, we must leverage communication abstractions that are well-known and already supported on traditional networks. In this paper we propose TinySIP as a communication abstraction for accessing sensor-based services. TinySIP is based on the Session Initiation Protocol (SIP), which is a standard application-level signaling mechanism. Users on traditional networks remotely interact with a sensor network service by sending SIP messages. A gateway maps the SIP abstractions to the corresponding TinySIP abstractions and propagates the messages to the sensor nodes. We are currently planning on deploying the SIP-based solution that we propose on a research testbed to enable users on a wireless mesh to access the in-network storage and event correlation services offered by a sensor network consisting of 20 MicaZ sensor nodes.

关键词： sensor nodes

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